French · Pronunciation Guide
mehr-SEE, with the weight on the second syllable and a throat-made "r" that barely colours the vowel.
mer-CI, with the second syllable slightly longer and higher. Because English has the near-identical word "mercy" stressed the other way, this is a word where you have to consciously push the beat to the end.
Listen: merci
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Merci beaucoup pour ton aide.
Thank you very much for your help.
Listen: Merci beaucoup pour ton aide.
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"Merci beaucoup pour ton aide" ends with a liaison you must make: "ton aide" is /tɔ̃.n‿ɛd/, so the nasal vowel of "ton" is followed by a real "n" bridging into "aide". That final "d" in "aide", meanwhile, is pronounced, because it is followed by a silent "e" — the "e" exists precisely to keep the consonant alive.
The pull of the English word "mercy" is enormous: it has the same letters, the same meaning-adjacent origin, and the stress on the first syllable. Say "MER-see" with an American "r" colouring the first vowel and you have said an English word with a French coat of paint. Keep the first vowel as a plain "eh", let the "r" happen in your throat without reshaping the vowel, and put the lift on "-ci".